Can Google's patented ML algorithms be used commercially?
Can you use them commercially?

Yes. 

Is Google able to sue you any time they want?

Yes. 

Will they do that...

Probably not. 

Google isn't a known patent bully, I would give them the benefit of the doubt in this kind of situation and say, unless you start really giving them real trouble, they wouldn't do anything. Some companies/people know an idea can really be used for good and patent it to protect its use not to inhibit its use. By patenting the idea and setting a precedent of not suing they are effectively allowing everyone to benefit. Maybe in the future Google cloud, Azure and Amazon web services will lose some money in a legal battle, but I doubt you personally will be hit with a lawsuit.